Temperature dependent damping studies of Ni-Mn-Ga polymer composites
نویسندگان
چکیده
منابع مشابه
Phonon softening in Ni-Mn-Ga alloys
The TA2 phonon dispersion curves of Ni-Mn-Ga alloys with different compositions which transform to different martensitic structures have been measured over a broad temperature range covering both paramagnetic and ferromagnetic phases. The branches show an anomaly (dip) at a wave number that depends on the particular martensitic structure, and there is softening of these anomalous phonons with d...
متن کاملMagnetomechanical properties of a high-temperature Ni–Mn–Ga magnetic shape memory actuator material
A Ni–Mn–Ga single crystal with a phase transformation temperature above 350 K is investigated. The material demonstrates a magnetic field-induced strain (MFIS) of 7% at room temperature and of 4.2% at 350 K. The temperature dependence of the magnetic anisotropy and of the saturation magnetization has been studied in detail. At 350 K a maximum magnetic stress of 1.6 MPa and a twinning stress of ...
متن کاملTemperature dependence of reversible field-induced strain in Ni–Mn–Ga single crystal
Temperature dependence of reversible magnetic shape memory effect and magnetization changes were studied in Ni49.7Mn29.1Ga21.2. The twinning stress, equivalent magnetic stress, switching field and maximum strain all increase with decreasing temperature. A 5–6% reversible strain is observed in the temperature range of 307–263 K and it sharply decreases to 1–2% at temperatures below 263 K. The ma...
متن کاملRole of Shuffles and Atomic Disorder in Ni-mn-ga
We report results of ab-initio calculations of the ferromagnetic Heusler alloy Ni-Mn-Ga. Particular emphasis is placed on the stability of the low temperature tetragonal structure with c/a = 0.94. This structure cannot be derived from the parent L21 structure by a simple homogeneous strain associated with the soft elastic constant C ′. In order to stabilise the tetragonal phase, one has to take...
متن کاملElastic constants of Ni-Mn-Ga magnetic shape memory alloys
We have measured the adiabatic second order elastic constants of two Ni-Mn-Ga magnetic shape memory crystals with different martensitic transition temperatures, using ultrasonic methods. The temperature dependence of the elastic constants has been followed across the ferromagnetic transition and down to the martensitic transition temperature. Within experimental errors no noticeable change in a...
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ژورنال
عنوان ژورنال: Bulletin of Materials Science
سال: 2011
ISSN: 0250-4707,0973-7669
DOI: 10.1007/s12034-011-0189-y